*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:Arial,sans-serif;background:#111;color:#eee}.app{display:grid;grid-template-columns:420px 1fr;height:100vh}.sidebar{background:#181818;border-right:1px solid #2b2b2b;padding:14px;overflow:auto}.sidebar h1{margin:0 0 12px;font-size:20px}.sidebar h2{margin:16px 0 8px;font-size:14px;color:#8fd3ff}textarea{width:100%;min-height:250px;resize:vertical;background:#0f0f0f;color:#f0f0f0;border:1px solid #333;border-radius:8px;padding:10px;font-family:Consolas,monospace;font-size:12px;line-height:1.4}.row{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}button,select{background:#242424;color:#fff;border:1px solid #3a3a3a;border-radius:8px;padding:10px 12px;cursor:pointer}button:hover,select:hover{background:#2e2e2e}.info{margin-top:12px;padding:10px;background:#101820;border:1px solid #22313f;border-radius:8px;font-size:13px;line-height:1.5}.piece-list{display:grid;gap:8px;margin-top:10px}.piece-item{padding:10px;border:1px solid #303030;border-radius:8px;background:#141414;cursor:pointer}.piece-item:hover{background:#1d1d1d}.piece-item.active{border-color:#4ba3ff;background:#152332}.main{display:grid;grid-template-rows:50px 1fr;min-width:0;min-height:0}.toolbar{display:flex;align-items:center;justify-content:space-between;background:#151515;border-bottom:1px solid #2a2a2a;padding:8px 12px}.title{font-size:14px;font-weight:700}.content{display:grid;--panel2d-width: 420px;grid-template-columns:var(--panel2d-width) 8px 1fr;min-width:0;min-height:0}.panel2d{background:#0d0d0d;display:flex;flex-direction:column;min-height:0}.panel2dHeader{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;border-bottom:1px solid #222;font-size:13px;color:#8fd3ff}.panel2dTools{display:inline-flex;gap:6px}.panel2dTools button{padding:4px 8px;font-size:12px;line-height:1;border-radius:6px}.canvas2dWrap{flex:1;min-height:0;padding:10px}canvas#canvas2d{width:100%;height:100%;display:block;background:#0a0a0a;border:1px solid #242424;border-radius:8px;cursor:grab}.splitter{background:#1a1a1a;border-left:1px solid #2a2a2a;border-right:1px solid #2a2a2a;cursor:col-resize;position:relative}.splitter:before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:3px;height:56px;border-radius:3px;background:#4a4a4a}.viewer3d{position:relative;background:#0a0a0a;min-width:0;min-height:0}#threeContainer{width:100%;height:100%}.legend{position:absolute;top:10px;right:10px;background:#0f0f0feb;border:1px solid #333;border-radius:8px;padding:10px 12px;font-size:12px;line-height:1.5;min-width:180px}.dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px;vertical-align:middle}.note{font-size:12px;color:#aaa;margin-top:10px;line-height:1.5}.error{color:#ff9d9d;margin-top:10px;white-space:pre-wrap;font-size:12px;line-height:1.4}